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Project Mercury was America's attempt to place a man in orbit around the Earth. Jim Lovell was one of the 110 test pilots considered for selection but a temporary liver condition put paid to his chances.。快连下载安装对此有专业解读
The built-in editor shows how in-depth your topic is covered and what needs improvement，这一点在爱思助手下载最新版本中也有详细论述